Balancing machine



f 1,547,487 R. c. ALLEN BALANCING MACHINE Filed Feb, 28; 1921 July 28,1525,

To diatom Patented July 2 8, 1925'.

BALANCING MACHINE.

it may concern: 1'

.Be it known that I, Ronnn'r G. ALLEN,

' a citizen of the United States, and a resident qbersf balanced are theunba to of and State of Pennsylvania, have invented a curate balancing,to make allowance for ment ofvthe end of abody adjacent to a fixedEsslngton, in the county of Delaware new and useful Improvement inBalancing achines, of which the following is a speci- -fication. r

My invention relates to balancing machines, particularlyof the combinedstatic and dynamic type,xand it has for an object to provide a methodand apparatus of this character which shall be capable of simple shallgive accurate operation and which results.

As: heretofore constructed, balancing machines for placing bodies inrunning or dy' namic balance have required, in their operation,considerable calculation and cut-andtry operations or else an elaboratecompensating mechanism; Accordingly, it is the purpose of my inventionto avoid these objections by adesign of machine wherein the unbalancedcondition of a rotor is indicated at one end at a time and appropriatecorrections made to overcome the unbalanced condition. After one end isbalanced, an adjustment of the machine is made for balancing the otherend, and then the other end is balanced.

It'has been proposed to balance rotary bodies by havingvibratorysupports or mem or each end of a body. Such vibratory members orsupports are ordinarily provided with bearings for'the trunnions of abody; and, for convenience, rotors to be ance o ning's at each end. onevi ratory member is held while the other is free-to vibrate, andbalancing operations arecarried on in connection with the free end,after which the free end is fixed and the formerly fixed end is freedfor bal In operation,

. ancing. In view of the fact that the planes of the balance openingsare spaced from the median lanes of the sup ortin bearings,

ance at the end 0 a body adjacent a fixed su port develops a momentwhich combines wit the moment at the produce a resultant which is thequantity actually observed. In order to it is, therefore,

the disturb' mg mosuppqrt inorder to ascertain the true extion, inwhich:

ordinarily provided with bal free end to,

effect acnecessary end of the body. If the body being balanced clude theaxis of vibration, then the disturbing moment at that end would be zeroand the observations at the other end would truly indicate the positionand extent of unbalance. In accordance with my invention, therefore, Iprovide a vibratory member whose axis of vibration may be adjusted tocoincide with either plane of correction so that corrections-may be madeto compensate for unbalance at each end of a rotor wighout affecting thebalance at the other en.

' Apparatus embodying features of my in vention is illustrated in theaccompanying drawings, forming a part of this applica- 1g. 1 is a sideelevation of a balancing machine incorporating my improvements;

Fig. 2 is an end elevation thereof; and Figs. 3 and 4 are detailed viewsof the lower face of the vibratory frame and the upper face of thebase/plate, respectively. Referring to the drawings for a more detaileddescription of my invention, a balancing machine 9 is shown, upon whichis mounted a rotary body 10 to be placed in static and dynamic balance.v

The machine comprises a base member 11,- preferably' of massive andrigid construction, to which isconnected a vibratory frame" 12 bysuitable flexible means, for example, an I-beam 13, which has itswebportion dis posed transversely or normally with res gect to the basemember and the frame mem er. The vibratory frame 12 carries upon itsupper face bearing pedestals 13 and 14 for the trunnions or journalsbalanced.

Adjustable spring connections are provided tween the vibratory frame andthe rigid base member, there preferably being a connection for each endof the vibratory frame. Each adjustable connection comuses a spring 15secured to the base memer' at its lower end and secured by means of aswivel 16 to, an adjustable screw 17 having a hand wheel 18 for manualopera tion; The screws are'mountedin brackets;

19 secured to the vibratory frame.

-1 j usting the screws,

the tension of the-springs J i may be varied, whereby they are capableoffunctioning to magnify the vibrations of the member beingbalancedthrough resonance.

The base member 11 is provided with machined grooves 20- and thevibratory frame has longitudinal slots 21. The I-beam connection 13 hasappropriate openings for adjusting screws or bolts 22 fitting in themachined grooves 20 and for'adjusting screws or bolts 23 fitting inlongitudinal slots 21. This construction permits of the adj ustment ofthe I-beam connection longitudii example, end planes of the journalnally of the vibratory frame, whereby it may be brought into the planeof a particular portion ofthe body to be balanced, for

correction.

The rotor 10 is provided with journals or trunnions adapted to bemounted on bearings carried by the pedestals 13 and 1s. As shown in Fig.2, each of the bearings comprises pivoted shoes 25 which'cooperate withor trunnion portions'to form load-supporting wedge-shaped oil films. A

, tive arc of bearing,

deviations of the journal from its true theomature wise occur. In so faras wherein any appropriate bearing of this type has a high capacity forloads due to the uniform distribution of the load throughout the surfaceof the wedgeance. The armature shaft is connected to one .of thejournals or trunnions of the rotor means of avflexible shaft 30 and anappropriate cou ling 31; Motor leads 32 are shown carrie by the*vibratory frame 12 and connected to the base member 11, the

portions thereof between the vibratory frameand the base member 11.being readily extensible whereby the vibrations of the vi- "bratoryframe are not sensibly affected thereby.

An indicating device 35 ismounted on the base'member 11 and cooperateswith the [vibratory frame to indicate vibrations as well as theirmagnitude.

' order to balance the body,

The rotor is rovided with an annular I series of'tapped oles 36 in'e'ach'end, equidistantly spaced circumferentially, and into whichthreaded plugs may be inserted in although it will beobvious that'anymode of mod1fyin the distribution of mass might be adop nals by means ofa anced in a be In other words,

shaft into static and dynamic bal-- therefore such limitations] shallThe operation of apparatus incorporating my improvement is as follows:The ro'-- tary body 10 to be placed in static and dynamic balance hasits journalor trunnion portions mounted in the bearings carried by thepedestals 13 and 14:. The armature shaft 27, which, with its armature,has been placed in static and dynamic balance, is

connected to one of the trunnions or jourin position with reference 'tothe vibratory frame and base member with itsweb portion in the verticalplane of one seriesof tapped openings 36; whereupon the electric motor.is started and vibrations of the vibratory frame 12 in a vertical planeare observed on the indicator 35 when the revolutions per minutecorrespond to the number of natural- .vibrations per minute of thevibratory frame, that is, when the amplitude of the vibrations is amaximum.- are inserted in the openings 36 until the vibrationssubstantially cease, the size and location being determined by trial anderror. The springs 15 may varied for'the purpose of properly levelingthe vibratory frame and glving the springs adequate tension. After theright-hand end of the rotating body has attained a state of runningbalance, the I-beam connection is shifted relatively base member andsecured in position with its web' portion in the plane of the righthandtapped openings 36 whereupon the flexible shaft and cou- 'pling. Theadjustable I-beam 13 is secured Threaded plugs have their tension to thevibratory frame and body is rotated and the left-hand end balsimilarmanner. From the foregoing, it will be seen that I have devised abalancing machine in which the operation of the balancing is divided. Ibalance one end of a rotary body and then balance the other, therebyeliminatin considerable calculation, cut-and-try operations or elaboratecompensating mechanisms.

While I have shown an-I-beamconnection.

between the vibratory frame or member12 andthe base member or bed-plate11, it will be obvious'to those skilled in the art; that any arrangementwhich will permit of.

the-vibratory membermoving about an axis falling wit in one of thecorrection planes may be used. I wish it to be understood,

this specification and the appended claims in abroad sense tofsignif'yany type of con' that the word flexible is used n i necti'on which willpermlt of movement in the manner-stated. I a While I have shown myinvention in but one form, it will be' obvious to those skilled in theart that it is not so limited but issusceptible of various other.changes and'modifications, without'departing fromthe spirit thereof and'I desire, he'refore, that .onl

be placed thereupon as are imposed by the prior art or as arespecifically set forth in the appendedclaims.

a flexible supporting What I claim is:

1. In a balancing machine, the combination of a base member, a vibratoryframe adapted to support a rotary body to be placed in static anddynamic balance, and connection between the vibratory frame and the basemember and adjustable relative thereto to be brought into the plane ofone end of the rotary body While the other end is-being balanced.

2. A balancing'machine comprising a base member, a vibratory frame,bearings carried by the frame for a rotary member adapted to have endbalancing portions to be baling the vibratory frame and the base memherand adjustable relatively to the frame and base member whereby/it may bebrought into the vertical plane of one end balancing portion while theother end balancing portion is being balanced.

3. In a balancing machine, the combination of a vibratory member, a basemember, bearings carried by the vibratory member for a member to bebalanced, a motor carried by the vibratory member, means to balance therotary element of the motor, a flexible shaft adapted to connect themotor and the member to be balanced, an I-beam for supporting thevibratory member on the base member and adjustable with reference to thebase member and vibratory member so that 4 it may be brought into theplane of one endof the body to be balanced while the other end balancingportion is beingbalanced.

4. A balancing 'machine comprising a vibratory supporting member for abody to anced, a flexible supporting member connectsubscribed my bebalanced, abase member, a flexible member disposed transversely of andbase members, and means whereby the flexible member may be adjusted todifferent positions longitudinally of the vibratory supporting and basemembers.

5. In a balancing machine, the combination of a vibratory frame forsupporting a body to be balanced which has endplanes of correction, abase member, and an I-beam connection between the vibratory frame andthe base member and adjustable with respect thereto so that the Webportion of the I-beam may be placed'in the correction plane of an end ofthe body while the other end is being balanced. I

6. In a balancing machine, the combination of a vibratory frame, a basemember, an I-beam member carried by the base member for supporting theframe, means for adjusting the I-beam member'in different positions withrespect to the base member and the frame,-springs for connecting theframe to the base member, and means for varying the tension of thesprings.

7. In a balancing machine, the combination of a vibratory member-,a basemember,

an I-beam member carried by the base member for supportlng the means foradjusting the different positions with bratory member and the adjustabletension means of the member.

In testimony vibratory member, I-beam member to respect to the vibetweenthe ends vibratory member and the; base whereof, I have hereunto ruary,1921.

ROBERT C. ALLEN.

name this 23rd day of Febthe supporting base member, and

